Start a MathUtils file

It has fast(inv)sqrt and weightedAverage.

Also cleanup the last ocmmit a bit.

1 files changed, 0 insertions, 24 deletions

diff --git a/src/utils/fastsqrt.h b/src/utils/fastsqrt.h
deleted file mode 100644
index 78768149..00000000
--- a/src/utils/fastsqrt.h
+++ /dev/null
@@ -1,24 +0,0 @@
-/* A very fast function to calculate the approximate inverse square root of a
- * floating point value and a helper function that uses it for getting the
- * normal squareroot. For an explanation of the inverse squareroot function
- * read:
- * http://www.math.purdue.edu/~clomont/Math/Papers/2003/InvSqrt.pdf
- *
- * Unfortunately the original creator of this function seems to be unknown.
- */
-
-float fastInvSqrt(float x)
-{
-    union { int i; float x; } tmp;
-    float xhalf = 0.5f * x;
-    tmp.x = x;
-    tmp.i = 0x5f375a86 - (tmp.i >> 1);
-    x = tmp.x;
-    x = x * (1.5f - xhalf * x * x);
-    return x;
-}
-
-float fastSqrt(float x)
-{
-    return 1.0f / fastInvSqrt(x);
-}